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A plane is flying in the horizontal plane. At time t1 = 0 s with the components of its velocity are vx= 100 m/s and vy = 120 m/s. At time t2= 20 s the components are vx = 80 m/s and vy = 142 m/s. a. What was the change in the direction of the velocity? b. What is the change in the magnitude of the plane's velocity during this time? c. What are the components of the average acceleration for this interval? d. What are the magnitude and direction of the average acceleration for this interval?
A rifle with a barrel length of 57 fires an 11 bullet with a horizontal speed of 440. The bullet strikes a block of wood and penetrates to a depth of 12. What resistive force (assumed to be constant) does the wood exert on bullet.
Determine out the magnitude of the average force that the water exerts on the diver. This force is neoconservative.
A bungee jumper with mass 63 jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 47. He finally comes to rest 21.00 below the level of the bridge.
What least amount heat is needed to bring 20-g of water at 20C to the boiling point and completely boil it away.
As part of the safety investigation, two 1400 {rm kg} cars travelling at 23 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.7 {rm s} to stop, and (b) car that hits..
Find the minimum volume of concrete (y = 23.6 kN/m3) needed to keep the gate (1 m wide) in a closed position; l = 2 m. Note the hinge at the bottom of the gate. Explain briefly.
A 78-kg base runner begins his slide into second base when he is moving at a speed of 4.2 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches base.
During a crash test, a car moving at 60 km/ hr collides with a rigid barrier and comes to a complete stop in 200 ms.
charge of -2.95 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.097 m. The charges on the circle are -3.85 µC at the position due north and +5.20 µC at the position due ea..
An ocean liner leaves New York City and travels 16.10 ° north of east for 234 km. How far east and how far north has it gone? In other words, what are the magnitudes of components of the ship's displacement vector in directions (a) due east and (b..
What is the mass of the rim.
What is the magnitude of the centripetal acceleration.
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